Machine-tool for punching, stamping, &amp;c.



No. 655,267. Patented Aug. 7, man. A. DBEHMEYER.

MACHINE TOOL FUR PUNCHING, STAMPING, c.

(Application led Feb. 3, 1900.) (No Model.) 3 Sheets-Shes) l.

No. 655.267. Patented Aug. 7, |900. A. UBERMEYER.

MACHINE TUUL FOB PUNCHING, STAMPING, &.c.

(Application led, Feb. 8, 1900.)

3 Sheets-Sheet 2,

(No Model.)

we wams PETERS co, wuooumo.. vAsmNcwN, n. c.

No. 655,267. Patented Aug. 7, |900.

A. OB'ERMEYER.

MACHINE TOUL FDR PUNGHING, STAMPINl-, &c. (Application led Feb. 8,1900.)

(No Model.)

3 Sheets-Sheet 3.

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UNrrnn STATES PATENT OFFICE.

ALnXri'nmnRA OBERMEYER, or BARMEN-RITTERsI-IAUSEN, GERMANY.

MACHINE-TOOL FOR PUNCHING, STAMPING, 84C.

SPECIFICATION forming part of Letters Patent No. 655,267, dated August7, 1 90o.

Application filed February 3, 1900l Serial No. (Milla.V (No model.)

To all whom it may concern:

Be it known that I, ALEXANDER OBER- MEYER, a subject of the King ofPrussia, German Emperor, residing at Barmen Ritterehausen, Germany, haveinvented certain new and useful vImprovements in Machine-Tools forPunching, Stamping, and the Like, of which the following is a full,clear, and exact description.

The present invention relates to machine-Y tools for hammering,punching, stamping,and the like; and it consists of the details ofconstruction hereinafter set forth, and particularly pointed out in theclaims.

The objects of the invention are to provide means for always arrestingthe punching or stamping tool, which is of the vertically-reciprocatingclass, in its highest position, and, further, to provide means forincreasing the force of the downward stroke of the tool-carrier barinany desired measure, according to the nature of the work being done.

In order to render the present specification easily intelligible,reference is had to the accompanying drawings, in which similar lettersof reference denote similar parts throughout the several views.

Figure l is a side elevation of a machinetool provided with the improvedarresting device. Fig. 2 is afront elevation of the same; Fig. 3, asection on line A B of Fig. l; Fig. 4, a face elevation of the couplingdevice;

Fig. 5, a similar elevation showing the coup-r ling mechanism out ofengagement. Fig. 5 is a detail view of acoupling-pin, and Fig. 6l a topview of the coupling cam-fork. Fig. 7

, is a side elevation,partly in section,of the machine provided withmeans for increasing the blow of the tool at will; and Fig. 8 is a planof the same machine. Figs. 4, 5, and 6 are drawn to a larger scale.

Referring to Figs. l to 6, the vertically-reciprocating bar @carryingthe punching or stamping tool or hammer, is normally depressed either bymeans of the pair of springs b, which effect the blow, orvby theweightd. (Indicatedin dottedlines at Fig. l.) The bar is raised by a cam d,fast to the 'shaft f,which carries the combined driving-pulleys andiiywheel h,loosely mounted thereon and adapted to be coupled in apeculiar manner, hereinafter set forth, to the coupling-disk p, which isfast on the shaft f. The bar is raised by means of the roll m, mountedon a pin in the said bar c and running on the disk or cam d, the pin ofthe said roll being prolonged somewhat beyond the roll and engaging in avertical guideway formed by the adjacent edges of two angleirons e e,(see Fig. 3,) so as -4to insure the exact vertical reciprocation of thetool-bar o.

The coupling-disk p is provided with a laterally-extending boss, againstwhich the fork fi', mounted at the upper end of the rod o, is normallypressed by means'of a spring s, Fig. l. The coupling will be best seenfrom Figs. l, 4, 5, and 6. The coupling-fork i is tapered in thevertical plane, as will be seen from Fig. 6, and acts as a wedge or camto operate a laterally-movable coupling-pin g, mounted in the iiy-wheel71.' and normally pressed tolward the coupling-disk p by means of asmall spring r. The cam-surface of the fork t', when the latter is initsraised position, vacts against a lateral lug u, formed onthe headofthe pin g, Fig. 5, pressing the said pin back into its seat in theiiy-wheel and out of engagement with the slot o of the coupling-disk p.'W'hen the fork is in its downward position, Fig. 5, the spring r of thepin g pushes the latter out, so that as the fly-wheel rotates it willcome into engagement With the arc-shaped slot o of the coupling-disk 1Jand cause the same, and with it the shaft f and cam d, to rotateandoperate the tool-bar.V Now in order to arrest the tool-bar in itshighest position eachftime the same is placed out of action the disk pis provided with a peripheral depression w, Fig. 5, and thecoupling-fork t has a laterallyextendin glug k, which when the fork israised comesA into the depression to, and the impetus of the shaft fatthe moment of uncoupling will cause the disk@ to rotate until the lugklies at'the end of the depression w, in `which case the bar c will bearrested in its highest position. The part of the cam d corresponding tothe highest position ofthe tool-bar is advantageously provided with aslight depression into which the rollm will sinkwhen the cam comesaround, and thus offer a slight resistance to its further rotation,which slight resistance would only come into effect after the shaft fhad been uncoupled. The fork- .rod o is operated to cause the couplingof the parts by means of a pedal 1f or any other suitable leverarrangement.

The device operates in the following manner: Normally the coupling isdisengaged, the spring s holding the coupling-fork up in position topress back the coupling-pin g. Vhen the pedal is depressed, the fork iswithdrawn from the position shown at Fig. 4 to that of Fig. 5, and asthe fly-wheel revolves the cam-fork will have no effect on the pin g,which, as it comes around, will fall into engagement with the slot fuand rotate the shaft f. As soon as the pedal t is released the spring sraises the fork c', its cam-surface engages the lug u of the pin g,forcing the latter back, so that the disk p will be uncoupled. At thesame time it will be arrested in the position shown at Fig. 4 by the lugk, and as the y-wheel h, with the pin, revolves each time the pin comesaround it will be prevented from engagement with the recess fu, whichlies behind or within the bifurcation of the fork fi, by the cam-surfaceof the latter acting on the said lug. During its revolution on the faceof the disk p not covered by the lug the latter will slide on the saidface; but as soon as it comes within the reach of the recess u thecam-surface of the fork acts to retain it from engagement, as will bereadily understood on reference to Fig. 4.

This device-z'. e., the means for arresting the tool-carrying bar in itshighest positionhas a double advantage. First, the impetus of the shaftf is least when the bar c has attained its highest position against theoperation of the bar-depressing spring or weight, and, second, when themachine or bar is again started the tendency of the said bar is todescend under the iniiuence of its spring or weight, so that therestarting is facilitated.

Thus shocks will be avoided in both cases, in that the arrest of themechanism takes place at the moment at which the impetus is the least,while the release after arrest takes place at the most favorablemoment-viz., when the bar is ready to fall.

The second part of the invention relates to the means for varying theforce of the downstroke of the tool-carrying bar.

Referring to Figs. 7 and 8, the bar cis normally depressed by the springb, and the degree of tension of the said spring is determined by thecross-head z2, against which it rests. This cross-head is movable on theupper part ofthe said bar and controlled in its movements by a pair ofcords or wires z', wound on pulleyszz, mounted on a transverse shaft y.This shaft carries, furthermore, attached thereto a worm-wheel y, inwhich a worm a2' engages, said Worm being carried by or formed on ashaft x mounted in suitable bearings. This shaft is capable of movenientor rotation by means of two couplingdisks q q', fast thereon. Betweenthe said coupling-disks a sleeve is mounted loosely on the said shaft,said sleeve carrying two beltpulleys n n', fast thereon, and each havinga on the shaft.

clutch adapted to engage the coupling-disks' q q', according to theposition of the said sleeve VOne of the pulleys is provided with an openbelt and the other with acrossed one. The sleeve is operatedlongitudinally of the shaft by means of a lever n3, pivotally mountedand operated by a lever n* from an angle-lever a5 m7, pivotally mountedat n, said angle-lever being provided with a handle by means of which itmay be operated to shift the coupling of the pulleys n 'n'.

The device ismanipulated in the following manner: If it is desired toincrease the force of the downward stroke of the bar c,the lever nl isturned to effect the coupling of the sleeve-- pulley to operate theworm-wheel ,z in the direction of the arrow in Fig. 7, so that a pullwill be exercised on the wires or cords .2f to pull the cross-head z2down and increase the pressure of the spring b. If a lighter stroke isrequired, the lever is moved in the opposite direction, while if thesleeve is in the middle, between the two coupling-disks, the spring willoperate with its accustomed or normal force.

By the above-described device it is possible to vary the pressure of theactuating-spring according to the work being done, the saidspring-pressure being varied from the source of power driving themachine. It will be evident that the form of the spring b isirnmaterial, as the same might be formed in the same way as those ofFigs. 1 and 2 by adapting the mechanism described without departing fromthe spirit of the present invention.

I claim as my inventionl. In a machine-tool havingavertically-reciprocating tool-carrying bar and means for normallydepressing the same and a cam device to raise it, the combination ofmeans for arresting the bar, when the machineisstopped, in its highestposition immaterial of the position of the parts at the moment ofuncoupling, substantially as described.

2. In a machine of the class specified, the combination of avertically-reciprocating to0l carrying bar, means for depressing thesame, and a rotary cam to raise the same, a cam-shaft for the cam andmeans for drivin gthe same and a coupling-disk, a laterally-projectingpin rotated by the driven shaft and a recess in which said pin mayengage in the coupling-disk, a coupling-fork having cam-surfaces and alaterally-projecting lug, and a depression in the IOO periphery of thesaid coupling-disk in which Y the said lug engages when the fork is inits upper position said depression being located so that when the cam issupporting the tool-carrying bar in the highest position the lug will beengaged by its end in the manner and for the purpose substantially asdescribed.

3. In a machine of the class specified the combination of avertically-reciprocating toolcarrying bar, means for depressing the sameand means for raising the same consisting of a rotaryy cam, a depressionin the top of said cam into which the tool-bar roll, cooperating 1 'withsaid cam may sink and eil'ect a slight resistance when the bar is in itshighest posi-- tion and means for uncoupling the driving mechanism andfor arresting the cam-shaft in its said highest position substantiallyas described.

4. In a machine of the class specified having a spring to depress thetool-carrying bar, and a cross-head against which the said spring bears,the combination of a shaft having two coupling-disks and a doublecoupling-clutch mounted therebetween having an open and a closed belt,cords attached at either side to the said spring cross-head and guidedover suitable pulleys, gearing between said pulleys and the said shaftcarrying the couplings and means for operating the said couplings torotate the shaft in either direction at the fall LEXANDER OBERMEYER.

Witnesses:

OTTO KONIG, J. A. RITTERSHAUS.

